Web Client HTML and '$' problem

There is an odd problem we're having with the HTML (non-Ajax) version of the web client. When an e-mail is composed and sent from the web client, and a '$' is included (like in '$32.56'), the '$' appears as escaped - that is, what is seen on the received message is '\$'. This does not happen with the Ajax web client, nor Outlook or Thunderbird. I haven't tried Zimbra Desktop yet, but no one at our site is using Desktop.